The longevity of a blade depends largely on the coarseness of your beard and the sensitivity of your skin.
I have a tough beard and sensitive skin. Thus, I typically get 3-4 shaves from a blade before it becomes too dull to cut my beard or too rough on my face. Others can easily get a week's worth of shaves. Then there are those with less-sensitive skin who can push a blade out to three months.
I do pretty much the same thing.I always aim for 7 shaves on all my DE blades. I start on Monday and normally toss the blade after Sunday’s Shave. Most blades last the 7 shaves but some are really done after 4 but I push them to the seventh.
For me too. I did 30 shaves on one once. Highest score I’ve gotten on any blade. I find them to be excellent.Med Prep has the best longevity of the ones I've used.